Series S-70
Series S-70 Modular Pontoons
Designed to support cranes of up to 400 ton capacity, providing maximum buoyancy and strength within the weight and dimensional limits of permissible truck transport.
The S-70 Series (Depth: 7.0 ft, Width: 10.0 ft, Length: 20-40 ft) supports over 4.4 million lbs and can be combined in modular configurations with multiple units to meet diverse project needs. It is commonly used in marine construction for the most severe applications including track-mounted, ringer and mobile cranes, large hydraulic excavators, bucket dredges, and deep-well drilling rigs. The S-70 Series is also capable of transporting static loads exceeding 2,000 tons. Additionally, our smaller H-50 and S-50 series are often used in support roles where the higher load capacity of our Series S-70 equipment is required for main platforms.
Which series is right for your application?
Our Flexifloat® Application Engineers are experts in designing equipment to fit your unique marine construction needs. Contact us for a professional consultation to discover how the S-70 and our flexible solutions can get the job done.
Series S-70 Case Studies
EXPLORE OTHER SERIES

SERIES S-50
Designed for use in assemblies requiring up to 300-ton operational
load capacities.

SERIES H-50
Designed for assemblies requiring up to 100-ton operational
load capacities.
Series S-70 Modules
| Specifications | Quadrafloat™ | Duofloat™ | End Rake | Loading Ramp |
|---|---|---|---|---|
| Effective Length (ft.) | 40.0 | 20.0 | 10.0 | 20.0 |
| Effective Width (ft.) | 10.0 | 10.0 | 10.0 | 10.0 |
| Effective Depth (ft.) | 7.0 | 7.0 | 7.0 | 7.0 |
| Unit Weight (Lbs.) | 33,000 | 18,000 | 8,400 | 14,000 |
| Buoyant Capacity @ 65% Draft (Tons) | 40.0 | 19.0 | 2.1 | 3.5 |
| Deck Bearing (Distributed Load) Capacity (PSF) ... More Info | 5,000 | 5,000 | 3,000 | 6,000 |
| Deck Point Load (Concentrated Load) Capacity (Lbs. over a sqft.) ... More Info | 25,000 | 25,000 | 25,000 | 25,000 |
| Bottom Bearing Capacity (PSF) | 3,500 | 3,500 | 3,500 | 3,500 |
| Horizontal Lock Spacing (In.) | 60 | 60 | 60 | 60 |
| Vertical Lock Spacing (In.) | 76 | 76 | 76 | 76 |
| Lock Capacity @ 65% Yield (Tons) | 70 | 70 | 70 | 70 |
| Shipping Dimensions | Quadrafloat™ | Duofloat™ | End Rake | Loading Ramp |
|---|---|---|---|---|
| Overall Length (In.) | 485 | 245 | 129 | 246 |
| Overall Width (In.) | 125 | 125 | 119 | 119 |
| Overall Depth (In.) | 84 | 84 | 84 | 84 |
| Cubage (Cu.Ft.) | 2,947 | 1,489 | 746 | 1,423 |
| Specifications | Quadrafloat™ | Duofloat™ | End Rake | Loading Ramp |
|---|---|---|---|---|
| Effective Length (m.) | 12.192 | 6.096 | 3.048 | 6.096 |
| Effective Width (m.) | 3.048 | 3.048 | 3.048 | 3.048 |
| Effective Depth (m.) | 2.134 | 2.134 | 2.134 | 2.134 |
| Unit Weight (kg.) | 14,969 | 8,165 | 3,810 | 6,350 |
| Buoyant Capacity @ 65% Draft (mt.) | 36.29 | 17.24 | 2.13 | 2.02 |
| Deck Bearing (Distributed Load) Capacity (kPa.) ... More Info | 239.40 | 239.40 | 143.64 | 287.28 |
| Deck Point Load (Concentrated Load) Capacity (kg. over a 305mm x 305mm area.) ... More Info | 11,340 | 11,340 | 11,340 | 11,340 |
| Bottom Bearing Capacity (kPa.) | 167.58 | 167.58 | 167.58 | 167.58 |
| Horizontal Lock Spacing (m.) | 1.524 | 1.524 | 1.524 | 1.524 |
| Vertical Lock Spacing (m.) | 1.930 | 1.930 | 1.930 | 1.930 |
| Lock Capacity @ 65% Yield (mt.) | 63.50 | 63.50 | 63.50 | 63.50 |
| Shipping Dimensions | Quadrafloat™ | Duofloat™ | End Rake | Loading Ramp |
|---|---|---|---|---|
| Overall Length (m.) | 12.319 | 6.223 | 3.277 | 6.248 |
| Overall Width (m.) | 3.175 | 3.175 | 3.023 | 3.023 |
| Overall Depth (m.) | 2.134 | 2.134 | 2.134 | 2.134 |
| Cubage (cu.m.) | 83 | 42 | 21.1 | 40 |